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B
-127.6 kJ
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C
+542.8 kJ
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D
-641.8 kJ
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Solution
The correct option is C +542.8 kJ
Given that,
S(g)+e−→S−(g);ΔH=−207.6kJ S(g)+2e−→S2−(g);ΔH=335.2kJ Now, (i) S−(g)→S(g)+e−;ΔH=207.6kJ (ii) S(g)+2e−→S2−(g);ΔH=335.2kJ Adding (i) and (ii), we get S−(g)+e−→S2−(g);ΔH=207.6+335.2=542.8 kJ